. >> but you say that we still depend on 20th century technology to power 21st century economy. what does that mean. >> that's referring to the electrical grid. we saw what 8 million people who lost power. we have a system that isn't ready for this kind of a disaster. you have a grid that can go down easily. even smaller events like halloween's storm last year. we have a system that's like the internet, more flexible, more resilient you can get it back online faster. >> people can tweet but still couldn't use internet or cell phones. >> exactly. the signature moment of the storm people tweeting that they had lost power which shows that very clearly. >> what are the big lessons back to the cover story, a lesson from the storm that makes a difference in terms of the future? >> a few. climate change clearly is real. scientists will differ how much climate change affect as storm like this. this will become more and more common in the future we'll have stronger storms, we'll have these coastal flooding events which are disastrous with sandy. one thing we need to deal with. secondaril